http://bugs.winehq.org/show_bug.cgi?id=11770
--- Comment #19 from Owen Rudge owen@owenrudge.net 2011-08-09 05:15:02 CDT --- (In reply to comment #18)
2bdcee13a083f68ef8482aa85f7859ee887a738b and b4b7724a790af8fdab693ef5d422a1b84d7941a7 seem related.
2bdcee13 adds support for sending attachments in a particular case - when a MAPI provider has been selected that only offers an Extended MAPI interface, not Simple MAPI. MS Outlook is one such application. It'll make no difference to the default Wine MAPI provider.
The code that was in b4b7724a is now in winemapi, but that just attempts to start whatever program handles the "mailto" protocol, which doesn't have (guaranteed) support for attachments. We can't assume that xdg-email will be available though (e.g., on OS X it definitely won't be). In theory we could try to see if xdg-email is present and use it if found, falling back to mailto: afterwards.